Estimates of variability in some genotypes of hyacinth bean (Dolichos lablab( L.)

Abstract:

A randomized complete block design with three replications was used for the study of extent of variability. Six genotypes of hyacinth bean (Dolichos lablab( L.) were used to study the extent of variability in yield, yield component and some morphological characters. Genetic coefficient of variation (GCV), heritability (h2)as well as the expected genetic advance under selection (GA) were determined over the two seasons 1996/97-1997/98. significant differences were detected for half of the characters between the six genotypes of hyacinth bean. The highest GCV in the first season (21.11) was given by number of reproductive branches / plant, whereas the lowest (1.6) was given days to maturity, while in the second season plant height gave the highest GCV (15.8) and days to 50%flowering gave the lowest (0.94). high estimate of heritability (>50%) were obtained for plant height in both seasons (69.92 and 5o.97), number of pods /reproductive branch (66.19), days to flowering (54.14) and number of reproductive branches/plant (54) in the first season and number of seeds /pod (76.7) in the second season. Low estimates of h2 (>20%) were obtained for 100-seed in the first season and days to 50% flowering as well as number of pods / reproductive branch in the second season. The highest GA in the first season was given by number of reproductive branches / plant and plant height (31.96 and 30.34, respectively), whereas the lowest for days to maturity. In the second season, the highest GA was given by plant height (23.24), whereas days to 50% flowering gave the lowest (0.36) Therefore, the estimate of genetic advance (GA) followed the same trend as that of GCV while there was no definite trend between heritability and either GA or GCV.